How do the following Shimano 8-speed cassettes differ?
Ignore differences in appearance.
CS-HG31, CS-HG41, CS-HG51They are phosphate coated, nickel plated & chrome plated respectively.

Which one lasts longer? More rust resistant? Less wear on chain?
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I don't care about appearance, so it is not a factor. Same goes for weight.Available gear ratios are fine.That leaves durability, rust resistance & chain wear. Unless you can think of other factors.
Please do not derail the thread.